[PATCH v2 2/2] i2c: Introduce i2c_str_read_write() and make use of it

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

str_read_write() returns a string literal "read" or "write" based
on the value. It also allows to unify usage of a such in the kernel.

For i2c case introduce a wrapper that takes struct i2c_msg as parameter.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
v2: fixed typo in exynos5 (LKP)
 drivers/i2c/algos/i2c-algo-pca.c     | 3 +--
 drivers/i2c/algos/i2c-algo-pcf.c     | 3 +--
 drivers/i2c/busses/i2c-at91-master.c | 3 +--
 drivers/i2c/busses/i2c-exynos5.c     | 3 +--
 drivers/i2c/busses/i2c-hix5hd2.c     | 3 +--
 drivers/i2c/busses/i2c-img-scb.c     | 5 ++---
 drivers/i2c/busses/i2c-sh_mobile.c   | 3 +--
 drivers/i2c/busses/i2c-tiny-usb.c    | 6 ++----
 drivers/i2c/busses/i2c-viperboard.c  | 6 ++----
 drivers/i2c/i2c-core-base.c          | 3 +--
 include/linux/i2c.h                  | 7 +++++++
 11 files changed, 20 insertions(+), 25 deletions(-)

diff --git a/drivers/i2c/algos/i2c-algo-pca.c b/drivers/i2c/algos/i2c-algo-pca.c
index 384af88e58ad..e5ac3eee7a99 100644
--- a/drivers/i2c/algos/i2c-algo-pca.c
+++ b/drivers/i2c/algos/i2c-algo-pca.c
@@ -119,8 +119,7 @@ static int pca_address(struct i2c_algo_pca_data *adap,
 	int sta = pca_get_con(adap);
 	int addr = i2c_8bit_addr_from_msg(msg);
 
-	DEB2("=== SLAVE ADDRESS %#04x+%c=%#04x\n",
-	     msg->addr, msg->flags & I2C_M_RD ? 'R' : 'W', addr);
+	DEB2("=== SLAVE ADDRESS %#04x+%s=%#04x\n", msg->addr, i2c_str_read_write(msg), addr);
 
 	pca_outw(adap, I2C_PCA_DAT, addr);
 
diff --git a/drivers/i2c/algos/i2c-algo-pcf.c b/drivers/i2c/algos/i2c-algo-pcf.c
index 7a01f2687b4c..232224bbd670 100644
--- a/drivers/i2c/algos/i2c-algo-pcf.c
+++ b/drivers/i2c/algos/i2c-algo-pcf.c
@@ -316,8 +316,7 @@ static int pcf_xfer(struct i2c_adapter *i2c_adap,
 		pmsg = &msgs[i];
 
 		DEB2(printk(KERN_DEBUG "i2c-algo-pcf.o: Doing %s %d bytes to 0x%02x - %d of %d messages\n",
-		     pmsg->flags & I2C_M_RD ? "read" : "write",
-		     pmsg->len, pmsg->addr, i + 1, num);)
+		     i2c_str_read_write(pmsg), pmsg->len, pmsg->addr, i + 1, num);)
 
 		ret = pcf_doAddress(adap, pmsg);
 
diff --git a/drivers/i2c/busses/i2c-at91-master.c b/drivers/i2c/busses/i2c-at91-master.c
index c0c35785a0dc..3761a6cb320f 100644
--- a/drivers/i2c/busses/i2c-at91-master.c
+++ b/drivers/i2c/busses/i2c-at91-master.c
@@ -523,8 +523,7 @@ static int at91_do_twi_transfer(struct at91_twi_dev *dev)
 	 * writing the corresponding bit into the Control Register.
 	 */
 
-	dev_dbg(dev->dev, "transfer: %s %zu bytes.\n",
-		(dev->msg->flags & I2C_M_RD) ? "read" : "write", dev->buf_len);
+	dev_dbg(dev->dev, "transfer: %s %zu bytes.\n", i2c_str_read_write(dev->msg), dev->buf_len);
 
 	reinit_completion(&dev->cmd_complete);
 	dev->transfer_status = 0;
diff --git a/drivers/i2c/busses/i2c-exynos5.c b/drivers/i2c/busses/i2c-exynos5.c
index b812d1090c0f..4d3fe3cea688 100644
--- a/drivers/i2c/busses/i2c-exynos5.c
+++ b/drivers/i2c/busses/i2c-exynos5.c
@@ -744,8 +744,7 @@ static int exynos5_i2c_xfer_msg(struct exynos5_i2c *i2c,
 	if (ret < 0) {
 		exynos5_i2c_reset(i2c);
 		if (ret == -ETIMEDOUT)
-			dev_warn(i2c->dev, "%s timeout\n",
-				 (msgs->flags & I2C_M_RD) ? "rx" : "tx");
+			dev_warn(i2c->dev, "%s timeout\n", i2c_str_read_write(msgs));
 	}
 
 	/* Return the state as in interrupt routine */
diff --git a/drivers/i2c/busses/i2c-hix5hd2.c b/drivers/i2c/busses/i2c-hix5hd2.c
index 61ae58f57047..fefa5db52138 100644
--- a/drivers/i2c/busses/i2c-hix5hd2.c
+++ b/drivers/i2c/busses/i2c-hix5hd2.c
@@ -332,8 +332,7 @@ static int hix5hd2_i2c_xfer_msg(struct hix5hd2_i2c_priv *priv,
 	if (timeout == 0) {
 		priv->state = HIX5I2C_STAT_RW_ERR;
 		priv->err = -ETIMEDOUT;
-		dev_warn(priv->dev, "%s timeout=%d\n",
-			 msgs->flags & I2C_M_RD ? "rx" : "tx",
+		dev_warn(priv->dev, "%s timeout=%d\n", i2c_str_read_write(msgs),
 			 priv->adap.timeout);
 	}
 	ret = priv->state;
diff --git a/drivers/i2c/busses/i2c-img-scb.c b/drivers/i2c/busses/i2c-img-scb.c
index 8e987945ed45..772443059f49 100644
--- a/drivers/i2c/busses/i2c-img-scb.c
+++ b/drivers/i2c/busses/i2c-img-scb.c
@@ -950,9 +950,8 @@ static irqreturn_t img_i2c_isr(int irq, void *dev_id)
 			    INT_FIFO_EMPTY |
 			    INT_FIFO_FULL))) {
 		dev_crit(i2c->adap.dev.parent,
-			 "fatal: clock low timeout occurred %s addr 0x%02x\n",
-			 (i2c->msg.flags & I2C_M_RD) ? "reading" : "writing",
-			 i2c->msg.addr);
+			 "fatal: clock low timeout occurred when %s addr 0x%02x\n",
+			 i2c_str_read_write(&i2c->msg), i2c->msg.addr);
 		hret = ISR_FATAL(EIO);
 		goto out;
 	}
diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c
index 72f024a0c363..2b569403ce71 100644
--- a/drivers/i2c/busses/i2c-sh_mobile.c
+++ b/drivers/i2c/busses/i2c-sh_mobile.c
@@ -409,8 +409,7 @@ static irqreturn_t sh_mobile_i2c_isr(int irq, void *dev_id)
 	pd->sr |= sr; /* remember state */
 
 	dev_dbg(pd->dev, "i2c_isr 0x%02x 0x%02x %s %d %d!\n", sr, pd->sr,
-	       (pd->msg->flags & I2C_M_RD) ? "read" : "write",
-	       pd->pos, pd->msg->len);
+		i2c_str_read_write(pd->msg), pd->pos, pd->msg->len);
 
 	/* Kick off TxDMA after preface was done */
 	if (pd->dma_direction == DMA_TO_DEVICE && pd->pos == 0)
diff --git a/drivers/i2c/busses/i2c-tiny-usb.c b/drivers/i2c/busses/i2c-tiny-usb.c
index 7279ca0eaa2d..74a435d7c308 100644
--- a/drivers/i2c/busses/i2c-tiny-usb.c
+++ b/drivers/i2c/busses/i2c-tiny-usb.c
@@ -71,10 +71,8 @@ static int usb_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
 
 		pmsg = &msgs[i];
 
-		dev_dbg(&adapter->dev,
-			"  %d: %s (flags %d) %d bytes to 0x%02x\n",
-			i, pmsg->flags & I2C_M_RD ? "read" : "write",
-			pmsg->flags, pmsg->len, pmsg->addr);
+		dev_dbg(&adapter->dev, "  %d: %s (flags %d) %d bytes to 0x%02x\n",
+			i, i2c_str_read_write(pmsg), pmsg->flags, pmsg->len, pmsg->addr);
 
 		/* and directly send the message */
 		if (pmsg->flags & I2C_M_RD) {
diff --git a/drivers/i2c/busses/i2c-viperboard.c b/drivers/i2c/busses/i2c-viperboard.c
index 8b5322c3bce0..dec12e904aca 100644
--- a/drivers/i2c/busses/i2c-viperboard.c
+++ b/drivers/i2c/busses/i2c-viperboard.c
@@ -278,10 +278,8 @@ static int vprbrd_i2c_xfer(struct i2c_adapter *i2c, struct i2c_msg *msgs,
 	for (i = 0 ; i < num ; i++) {
 		pmsg = &msgs[i];
 
-		dev_dbg(&i2c->dev,
-			"  %d: %s (flags %d) %d bytes to 0x%02x\n",
-			i, pmsg->flags & I2C_M_RD ? "read" : "write",
-			pmsg->flags, pmsg->len, pmsg->addr);
+		dev_dbg(&i2c->dev, "  %d: %s (flags %d) %d bytes to 0x%02x\n",
+			i, i2c_str_read_write(pmsg), pmsg->flags, pmsg->len, pmsg->addr);
 
 		mutex_lock(&vb->lock);
 		/* directly send the message */
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 94c0663a39a6..9811bb44a2e0 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -2004,8 +2004,7 @@ module_exit(i2c_exit);
 static int i2c_quirk_error(struct i2c_adapter *adap, struct i2c_msg *msg, char *err_msg)
 {
 	dev_err_ratelimited(&adap->dev, "adapter quirk: %s (addr 0x%04x, size %u, %s)\n",
-			    err_msg, msg->addr, msg->len,
-			    msg->flags & I2C_M_RD ? "read" : "write");
+			    err_msg, msg->addr, msg->len, i2c_str_read_write(msg));
 	return -EOPNOTSUPP;
 }
 
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index fbda5ada2afc..3cfaad39cc24 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -20,7 +20,9 @@
 #include <linux/rtmutex.h>
 #include <linux/irqdomain.h>		/* for Host Notify IRQ */
 #include <linux/of.h>		/* for struct device_node */
+#include <linux/string_helpers.h>	/* for str_read_write() */
 #include <linux/swab.h>		/* for swab16 */
+
 #include <uapi/linux/i2c.h>
 
 extern struct bus_type i2c_bus_type;
@@ -934,6 +936,11 @@ static inline u8 i2c_8bit_addr_from_msg(const struct i2c_msg *msg)
 	return (msg->addr << 1) | (msg->flags & I2C_M_RD ? 1 : 0);
 }
 
+static inline const char *i2c_str_read_write(const struct i2c_msg *msg)
+{
+	return str_read_write(msg->flags & I2C_M_RD);
+}
+
 u8 *i2c_get_dma_safe_msg_buf(struct i2c_msg *msg, unsigned int threshold);
 void i2c_put_dma_safe_msg_buf(u8 *buf, struct i2c_msg *msg, bool xferred);
 
-- 
2.35.1